I upgraded my creative mode world from 1.21.10 to 1.21.11, and after the upgrade, my zombie horse despawned. In 1.21.11, zombie horses despawn unless you right-click them, which I did not do in time after the upgrade.
Steps to reproduce:
Spawn a zombie horse in 1.21.10 (in the shade, so it won’t burn after the upgrade)
Upgrade the world to 1.21.11
Observed results:
The zombie horse loses its persistence and despawns.
Expected results:
The zombie horse would retain its persistence, as it did in 1.21.10.
Note that there was no way to right-click zombie horses in 1.21.10, so to prevent this from happening, the game should automatically give zombie horses persistence when upgrading the world.
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